I have a pair of “reference grade” audio earbuds. They arrived with a certified chart showing the actual frequencies and the earbud frequency response.
I rarely use them.
They came with a pair of silicone deep-in-the-ear-canal earbud tips. The earbuds are not “noise cancelling”, but are “noise isolating”. They eliminate everything except earthquakes.
I don’t use them for two reasons. The first is we are so used to bass-heavy headphones and speaker systems, that the truly accurate reproduction sounds a bit tinny.
Second, while the deep-in-the-ear-canal tips are not uncomfortable, I am 100% aware of them 100% of the time.
They are exceptional when I need to hear dialog accurately, and they are excellent in noisy environments. They don’t have any option for conversation short of ripping them out of your ears. I read lips, so this is not a real issue for me (as long as I am looking directly at you.). I changed the ear tips from silicone to memory foam. Marginally more comfortable, but also, less durable.
In any case, almost any earbuds with memory foam tips will improve noise attenuation.
Any deep-in-the-ear-canal earbuds with silicone or memory foam tips will be highly effective for noise attenuation.
I have a pair of gun-range hearing protectors that allow for conversation. But they are designed to attenuate that sudden report of a bullet. I don’t know how well they work for continuous noise.